Question

Interactive LearningWare 28.1 reviews the concepts that play roles
in this problem. The distance from earth to the center of our
galaxy is about 31,000 ly (1 ly = 1 light year = 9.47 x 1015 m), as
measured by an earth-based observer. A spaceship is to make this
journey at a speed of 0.9990c. According to a clock on board the
spaceship, how long will it take to make the trip? Express your
answer in years. (1 yr is equal to 3.16 x 107 s.)